Relations and Functions 5 Sample Paper with Answer Sheet

Prove that the function f: R  R, given by f(x) = 2x, is one – one. [1]

State whether the function is one – one, onto or bijective f: R  R defined by f(x) = 1+ x2
Prove that the function f: R  R, given by f(x) = 2x, is one – one. [1]